Extend qml value type for QMatrix4x4 to be more useful

Add functions for applying common transformations: translate, scale,
rotate and lookAt that are needed when building affine transformation
matrices.

It would be very useful to update the QtObject::method_matrix4x4()
function in qtdeclarative to allow calling Qt.matrix4x4() with no
arguments and results in creating an identity matrix.

Change-Id: Id66bb0e1435c015c25aaa717ca98f3aa5d539530
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/quick3d/quick3d/qt3dquickvaluetypes_p.h b/src/quick3d/quick3d/qt3dquickvaluetypes_p.h
index 1fec1f059..4aef66c14 100644
--- a/src/quick3d/quick3d/qt3dquickvaluetypes_p.h
+++ b/src/quick3d/quick3d/qt3dquickvaluetypes_p.h
@@ -261,6 +261,13 @@ public:
     void setM43(qreal value) { v(3, 2) = value; }
     void setM44(qreal value) { v(3, 3) = value; }
 
+    Q_INVOKABLE void translate(const QVector3D &t) { v.translate(t); }
+    Q_INVOKABLE void rotate(float angle, const QVector3D &axis) { v.rotate(angle, axis); }
+    Q_INVOKABLE void scale(float s) { v.scale(s); }
+    Q_INVOKABLE void scale(float sx, float sy, float sz) { v.scale(sx, sy, sz); }
+    Q_INVOKABLE void scale(const QVector3D &s) { v.scale(s); }
+    Q_INVOKABLE void lookAt(const QVector3D &eye, const QVector3D &center, const QVector3D &up) { v.lookAt(eye, center, up); }
+
     Q_INVOKABLE QMatrix4x4 times(const QMatrix4x4 &m) const;
     Q_INVOKABLE QVector4D times(const QVector4D &vec) const;
     Q_INVOKABLE QVector3D times(const QVector3D &vec) const;